Door-spring



(No Model.)

' W. H., O. E. 82; A. F. GIWITS.

DOOR SPRING.

No. 462,699. Patented Nov. 10,1891.

7c Fig WITNESSES |NVE.NTORS.

z 5: 6 g I NITE STATES PATENT ()FFICE.

VILLIAM H. GIWITS, CHARLIE E. GIVVITS, AND ALBERT F. GIWITS, OF LINCOLN,NEBRASKA.

DOOR-SPRING.

SPECIFICATION forming part of Letters Patent No. 462,699, dated November10, 1891.

Application filed April 23, 1891.

To all whom it may concern.-

Be it known that we, WILLIAM H. GIWI'rs, CHARLIE E. GIwITs, and ALBERTF. GIVVITS, citizens of the United States, residing at Lincoln, in thecounty of Lancaster and State of Nebraska, have invented certain new anduseful Improvements in Door-Springs; and we do declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

Figure 1 is a perspective View of the middle portion of a door anddoor-jamb, the door being closed, with our invention applied thereto.Fig. 2 is a top View of the same, the door being opened. Fig. 3 is aperspective View of the tension-button used at the lower end of thespring.

Our invention relates to door-sprin gs and it consists in a novelarrangement of the spring and attachments.

In the drawings, A representsa door-jamb; and B a door having thecross-bar C.

D is a supporting-bracket for the spindle F, which is firmly attached tothe bracket at 7c.

G is a spiral spring surrounding the spindle, its upper end a beingsecured to lever E at (Z, and its lower end to the inner projection e ofthe tension-button I. The lower end of the spindle passes through hole aof the tension-button, moving freely in it, and on the outer side of thetension-button are the teeth on, which engage with the locking-pin f,passing through the lower end Z of the spindle.

E is a lever pivotally attached to the spindle, having the hook g at itsend, with which engages the connecting-rod II, having the eyes h h, itsother end being attached to the jamb by the screw-eye t'. (l, is a shortarm attached to the lever, having the stop I), which checks the movementof the connecting-rod Serial No. 390,087. (No model.)

at a suitable point as the door closes. The connecting-rod is bent at 0,so as to make the draft of the spring in line with the face of the jambwhen the door is fully opened.

It is obvious that by the tension-button the door-spring may be set atany desired tension, and that by the length'of the stop arm the motionof the lever in closing the door may be checked at any desired point.Both the stop-arm and the tension-button may be omitted without alteringour invention, and in the latter case the spring would be attached tothe spindle.

In our device the lever or crank points, when the door is closed, in adirection opposite to the draft of the connecting-rod, and is,substantially, parallel to it, and it would be 011 a dead-center if theconnecting-rod were straight; but the connecting-rod is bent, so thatthe lever is slightly removed from a dead-center, and yet so that thedraft required to move the lever against the resistanee of the springmust be stronger than that required when the lever is in any otherposition, whereby our device is strongest and most effective when thedoor is closed. The position of the lever when the door is closed may beregulated by the length of the stoparm. The bent connecting-rod has theadditional functionof allowing the door to come to or beyond adead-center when fully opened, which result is accomplished by solocating the bend that it just passes the jainb, whereby the draft ofthe spring holds it securely in position, as shown in Fig. 2.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is-

1. In a door-spring, the combination of the connecting-rod, bracket,spindle, spiral spring, and pivotally-attached lever, extending in adirection opposite to the draft of the connecting-rod and slightlyremoved from a deadcenter, substantially as shown and described.

2. A door-spring consisting of a connecting-rod, a supporting-bracket, aspindle rigidly attached to the bracket, a tension-button In testimonywhereof We affix our signatures 1o adjnstably attached to the spindle, aspiral in presence of two Witnesses. spring surrounding the spindle andattached at one end to the tension button and at the g 5 other end tothe lever, and a lever pivotally AI BERT F 'GINITS attached to thespindle and extending in a f direction opposite to the draft of theconnect- \Vitnesses:

ing-rod and slightly removed from adead-cen- H. N. ALLEN,

ter, substantially as shown and described. ALEX. MOKNIGHT.

